[NSRCA-discussion] Mintor 140 help

[Del K. Rykert]

Hi Paul..
    A couple of thought I can share with you.. If you are still using the same glow plug you broke the engine in with I would suggest changing it.  They get pretty nasty quickly when breaking it in. 
    You may want to add a header tank close to the engine and in line with your needle valve.  Do you always shut the throttle trim to low including idle trim when you shut down.. If still dripping confirms to me you are having gravity force fuel through the carb and it isn't totally closing its fuel flow. I have used hemostats to clamp the feed line to the carb. when I wanted to make sure not to flood and invertered engine. 
    I have never run the Mintor and not familiar with its appetite for fuel but I am guessing you are a tad on the small side with a 16oz tank.  
    Others may have more info to help you.
 
                 Del 
          nsrca - 473
  ----- Original Message ----- 
  From: Paul Duffy 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Saturday, July 01, 2006 11:56 AM
  Subject: [NSRCA-discussion] Mintor 140 help



  I have a Mintor 140 in a Patriot, using Mintor's header and carbon fiber pipe with ~1/2" between the header and pipe, turning an APC 17-12N.  I have just broken it in running 5 tanks (14 oz ea) of PowerMaster 15%.  I am running it on the rich side, turning about 7000-7200 rpm.  After starting the engine, I run it up for a few seconds before disconnecting the glow plug, then I bring it back to a fast idle (~2200 rpm).  By the time I get it out to the flight line to take off (a few seconds), when I open the throttle it loads up and dies.  I have started to lean out the idle mixture a bit and this seems to help.  I am a little hesitant to lean the main needle further - I had to replace the piston/ring/cylinder liner due to previous lean runs (entirely my fault).  Once I get it in the air, it seems to run fine, but the fuel seems to run out quickly.

  The other thing that is happening is that the carb drips a bit after I fill the tank.  It was much worse when the tank was above the wing tube, but I repositioned the tank in front of the wing tube, as low as possible, and it isn't as bad as it was.  This is a 16 oz tank.

  My plan is to do the following:
    a.. Start the engine, run it up to full throttle, monitor the rpm with a tach, then turn in the main needle until the rpm peaks and then drops (indicating lean), then richen it 3 or 4 clicks.  I'll try to fly it like this and see if I have the same problem. 
    b.. If it is still loading up on idle, then I'll lean the idle mixture further and repeat the previous step.
  Is this a good approach?  Any other thoughts?

  Thanks.


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